/*
 * Copyright [2021-present] [ahoo wang <ahoowang@qq.com> (https://github.com/Ahoo-Wang)].
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *      http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package me.ahoo.wow.infra.idempotency

import reactor.core.publisher.Mono

/**
 * Idempotency Checker .
 *
 * @author ahoo wang
 */
fun interface IdempotencyChecker {
    /**
     * 检查幂等性，如果该元素通过幂等性检查则返回 `true`,即表示该命令不重复.
     */
    fun check(element: String): Mono<Boolean>
}

object NoOpIdempotencyChecker : IdempotencyChecker {
    private val ALWAYS_TRUE = Mono.just(true)
    override fun check(element: String): Mono<Boolean> {
        return ALWAYS_TRUE
    }
}
